In addition to our customers making ΔP measurements across an orifice with our differential transducers, Tavis makes very accurate flow sensors with integral venturi tubes. In fact, the Space Station is chock full of Tavis flowmeters for environmental control and life support systems. Our Variable Reluctance technique and construction allow for very high line pressures even with low flow rates. Some of our more customized flowmeters have dual flow range capability.



Tavis Venturi flowmeters are used in applications with characteristics such as:
  • Custom venturi designs for specific flow requirements
  • Dual gage low/high flow rates
  • High line pressure
  • Output signal linear with either pressure or flow
  • No rotating/moving parts
  • Continuous analog output; flow is not sampled or digitized
  • Weld-mount, flange-mount, fitting-mount interface with system plumbing
  • 4 - 20 mA and 0/1-5 VDC outputs
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Unit of Measure
Items
Pressure Transducers for Manned Spacecraft - 10429

Pressure Transducers for Manned Spacecraft - 10474

Pressure Transducers for Manned Spacecraft - 10465

Pressure Transducers for Manned Spacecraft - 10507
Flow Range1 N/A (1 psid loss at max flow) 0 - 3.5 gpm N/A (1.1 psid loss at max flow) 500 - 1876 lb/hr1180 - 3100 lb/hr N/A (0.97 psid & 1.42 psid loss at max flow) 498 - 3108 lb/hr705 - 4409 lb/hr N/A (0.4 psid loss at max flow) 100 - 500 340 - 1700 800 - 4000 1000 - 5000 lb/hr
Line Pressure N/A 65 psia N/A 10 to 110 psia N/A 17.8 to 121 psia25 to 171 psia N/A 18 to 23 psia2 to 25 psia
Line Proof Pressure N/A N/A >172 psig N/A 182 psia256 psig N/A
Line Burst Pressure N/A N/A >200 psig N/A 304 psia341 psig N/A
Sensor Type N/A Variable Reluctance
Weight N/A Max 30 oz N/A Max 4.20 lb N/A Max 3.31 lb N/A Max 60 oz
Wetted Materials N/A 17-4 PH SST 410 SST N/A 17-4 PH SST 304L/321 CRES Inconel 600/625 N/A 17-4 PH SST 321 CRES N/A 17-4 PH SST 304L/321 CRES
Construction N/A Bolt-on Venturi/Tube Assy, O-ring Seals, Metallic Diaphragm N/A TIG Welded Gage/Venturi Assy, Custom Flange Mount N/A TIG Welded Gage/Venturi Assy N/A Bolt-on Venturi/Tube Assy, O-ring Seals, Metallic Diaphragm
Fittings / Ports N/A 1/2" Flared Tube Fitting N/A .90" DIA Inlet/Exit w/Custom Flange Mount N/A .75" DIA Inlet/Exit N/A Wiggins W903B16C Tube Connectors
Input Voltage N/A 20 - 40 VDC N/A Dual Input 15 VDC (each flow circuit) N/A 24 - 32 VDC N/A 20 - 40 VDC
Output Signal N/A 0.0 - 5.0 VDC (linear with venturi ΔP) N/A Dual Output : 4 - 20 mA (each flow circuit linear with venturi ΔP) N/A 0.8 - 5.0 VDC (linear with flow) N/A 0.2 - 5.0 VDC (linear with venturi ΔP)
Power/Current N/A Max 10 mA N/A 23 mA Max (each flow circuit) N/A Max 25 mA N/A Max 10 mA
Electrical Interface N/A MS3116 (10-6) Connector N/A NATC09Y11P35PB 13-Pin N/A Mates with D38999/2611-98SN 6-Pin N/A PT1H-10-6P
Reverse Polarity Protection N/A Yes
Isolation N/A >100 MΩ @ 100 VDC N/A N/A >50 MΩ @ 100 VDC N/A >100 MΩ @ 100 VDC
Output Impedance N/A ≤100 Ω N/A N/A ≤150 Ω N/A ≤1000 Ω
EMI N/A N/A capacitor filter per flow circuit N/A Inductor/ Capacitor Filter N/A
Compensated Temps N/A -65 °F to +165 °F (Operating -65 °F to +200 °F) N/A 33 °F to +122 °F (Fluid) -67 °F to +200 °F (Non-Operating) N/A 33 °F to +103 °F -49 °F to +149 °F (Non-Operating -65 °F to +180 °F) N/A -38 °F to +135 °F
Vibration N/A 20 g pk to 2000 Hz N/A 4.4 grms N/A 26 grms N/A 20 g pk to 2000 Hz
Shock N/A 20 g 11 ms Half Sine N/A N/A N/A 100 g 11 ms Half Sine
App Media N/A JP-4/JET A N/A Water N/A Water Flourinert N/A JP-4/JET A
Static Error Band2 N/A ±0.5% FSO N/A N/A N/A
Thermal Error2 N/A ±2.0% FSO Max N/A N/A N/A
Total Error Band (TEB)2 N/A N/A ±5% of Flow Rdg N/A ±5% of FS Flow @ 16% Flow, Decreasing to ±2.5% of FS Flow at 40% Flow to 100% Flow N/A ±5% FS @ 20% Flow, Decreasing to ±1% FS @ 100% Flow
Frequency Response3 N/A Flat ±5% to 250 Hz N/A N/A 1 s (10% to 90% Step Input) N/A
  • 1 The designs above are intended to convey just a few capabilities previously used in critical flow systems for discussion purposes. Tavis specializes in custom configurations and capabilities for your specific application. Discuss your flow system requirements with our engineers for your specific flow control needs.
  • 2 Many error band definitions and limits are possible, and these actual error bands are too specific to delineate herein. A clear definition and understanding of any error band is critical, and many manufacturers’ published errors or accuracies can be very misleading. Please consult Tavis regarding your specific error band requirements.
  • 3 Frequency Response given is for electronics only. Actual frequency response will depend on pressure range and media.